Honda EU30i Manual page 161

CYLINDER HEAD
VALVE GUIDE I.D.
Ream the valve guide (1) to remove any carbon
deposits before measuring.
TOOL:
Valve guide reamer, 5.510 (2)
Turn the special tool (Valve guide reamer) clockwise,
never counterclockwise.
Continue to rotate the special tool while removing it
from the valve guide.
Measure and record each valve guide I.D.
STANDARD:
SERVICE LIMIT:
If the measured valve guide I.D. is more than the
service limit, replace the valve guide (page 14-8).
Inspect the valve stem O.D. with this inspection.
VALVE STEM O.D.
Inspect each valve for bending or abnormal stem wear.
If necessary, replace the valve (page 14-4).
Measure and record each valve stem O.D.
STANDARD:
IN: 5.468 – 5.480 mm (0.2153 – 0.2157 in)
EX: 5.425 – 5.440 mm (0.2136 – 0.2142 in)
SERVICE LIMIT:
IN: 5.318 mm (0.2094 in)
EX: 5.275 mm (0.2077 in)
If the measurement is less than the service limit,
replace the valve (page 14-4).
Inspect the valve guide I.D. with this inspection.
GUIDE-TO-STEM CLEARANCE
Subtract each valve stem O.D. from the corresponding
valve guide I.D. to obtain the stem-to-guide clearance.
STANDARD:
IN: 0.020 – 0.044 mm (0.0008 – 0.0017 in)
EX: 0.060 – 0.087 mm (0.0024 – 0.0034 in)
SERVICE LIMIT:
IN: 0.10 mm (0.004 in)
EX: 0.12 mm (0.005 in)
If the calculated clearance is more than the service limit,
replace the valves (page 14-4) and valve guide.
• Recondition the valve seats whenever the valve
guides are replaced (page 14-8).
14-6
07984-2000001
5.500 – 5.512 mm
(0.2165 – 0.2170 in)
5.572 mm (0.2194 in)
(2)
COMBUSTION
CHAMBER SIDE:
(1)
VALVE SPRING SIDE: